Only show ‘Choose service’ if multiple services

When the user clicks ‘GOV.UK Notify’ in the header, they should, by
default, be redirected to the dashboard for their service. They should
only see the ‘Choose service’ page if they have multiple services.

This also allows some logic to be factored out of the template, so one
route now handles all this redirection.

In the future we might want to keep the last-used service in the
session, and always redirect to that. But for now, this should fix most
of the confusion for first-time users.

app/main/views/choose_service.py

@@ -1,13 +1,29 @@
 from flask import (render_template, redirect, url_for, session)
 from flask_login import login_required, current_user
-from app.main.dao import services_dao
+from app.main.dao.services_dao import ServicesBrowsableItem
+from app import service_api_client
 from app.main import main
 
 
 @main.route("/services")
 @login_required
 def choose_service():
-    services = services_dao.get_services(current_user.id)
     return render_template(
         'views/choose-service.html',
-        services=[services_dao.ServicesBrowsableItem(x) for x in services['data']])
+        services=[ServicesBrowsableItem(x) for x in service_api_client.get_services()['data']]
+    )
+
+
+@main.route("/services-or-dashboard")
+def show_all_services_or_dashboard():
+
+    if current_user.is_authenticated():
+
+        services = service_api_client.get_services()['data']
+
+        if 1 == len(services):
+            return redirect(url_for('.service_dashboard', service_id=services[0]['id']))
+        else:
+            return redirect(url_for('.choose_service'))
+
+    return redirect(url_for('main.index'))